Divergent incubation temperature effects on thermal sensitivity of hatchling performance in two different latitudinal populations of an invasive turtle

Kang, Chun-Quan; Meng, Qin-Yuan; Dang, Wei; Lu, Hong-Liang

doi:10.1016/j.jtherbio.2021.103079

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…Embryos incubated at 21°C showed greater sensitivity in their metabolic rates to increasing measurement temperatures (21°C to 33°C), compared with those reared at 27°C (Sun et al, 2021). Developmental temperatures can produce variation in the plasticity of physiological traits to affect post‐hatching growth and survival, and reproductive success (Andrews et al, 2000; Kang et al, 2021; Kar et al, 2022; Nord & Nilsson, 2011). Greater thermal sensitivity in metabolic rates in response to cool nest temperatures will likely serve an advantage, enabling individuals to make better use of warmer conditions when they do arise, and thereby hatch earlier, grow faster, and reach a size refuge (i.e.…”

Section: Discussionmentioning

confidence: 99%

Population divergence in maternal investment and embryo energy use and allocation suggests adaptive responses to cool climates

Pettersen

Ruuskanen

Nord

et al. 2023

Journal of Animal Ecology

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The thermal sensitivity of early life stages can play a fundamental role in constraining species distributions. For egg‐laying ectotherms, cool temperatures often extend development time and exacerbate developmental energy cost. Despite these costs, egg laying is still observed at high latitudes and altitudes. How embryos overcome the developmental constraints posed by cool climates is crucial knowledge for explaining the persistence of oviparous species in such environments and for understanding thermal adaptation more broadly. Here, we studied maternal investment and embryo energy use and allocation in wall lizards spanning altitudinal regions, as potential mechanisms that enable successful development to hatching in cool climates. Specifically, we compared population‐level differences in (1) investment from mothers (egg mass, embryo retention and thyroid yolk hormone concentration), (2) embryo energy expenditure during development, and (3) embryo energy allocation from yolk towards tissue. We found evidence that energy expenditure was greater under cool compared with warm incubation temperatures. Females from relatively cool regions did not compensate for this energetic cost of development by producing larger eggs or increasing thyroid hormone concentration in yolk. Instead, embryos from the high‐altitude region used less energy to complete development, that is, they developed faster without a concomitant increase in metabolic rate, compared with those from the low‐altitude region. Embryos from high altitudes also allocated relatively more energy towards tissue production, hatching with lower residual yolk: tissue ratios than low‐altitude region embryos. These results are consistent with local adaptation to cool climate and suggest that this is underpinned by mechanisms that regulate embryonic utilisation of yolk reserves and its allocation towards tissue, rather than shifts in maternal investment of yolk content or composition.

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Section: Discussionmentioning

confidence: 99%

Population divergence in maternal investment and embryo energy use and allocation suggests adaptive responses to cool climates

Pettersen

Ruuskanen

Nord

et al. 2023

Journal of Animal Ecology

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show abstract

“…We also found evidence for regional differences in the temperature sensitivity across incubation treatments (also known as thermal developmental plasticity); embryos incubated at 21 °C showed greater sensitivity in their metabolic rates to increasing measurement temperatures (21 °C to 33 °C), compared with those reared at 27 °C. Developmental temperatures can produce variation in the plasticity of physiological traits to affect post-hatching growth and survival, and reproductive success (Andrews et al, 2000; Kang et al, 2021; Kar et al, 2022; Nord & Nilsson, 2011). Greater thermal sensitivity in metabolic rates in response to cool nest temperatures will likely serve an advantage, enabling individuals to make better use of warmer conditions when they do arise, and thereby hatch earlier, grow faster, and reach a size refuge (i.e., minimum body size) from predation sooner.…”

Section: Discussionmentioning

confidence: 99%

“…Developmental temperatures can produce variation in the plasticity of physiological traits to affect post-hatching growth and survival, and reproductive success (Andrews et al, 2000;Kang et al, 2021;Kar et al, 2022;Nord & Nilsson, 2011). Greater thermal sensitivity in metabolic rates in response to cool nest temperatures will likely serve an advantage, enabling individuals to make better use of warmer conditions when they do arise, and thereby hatch earlier, grow faster, and reach a size refuge (i.e., minimum body size) from predation sooner.…”

Section: Region-level Differences In Embryo Energy Expenditure During...mentioning

confidence: 99%

Population divergence in maternal investment and embryo energy use and allocation reveals adaptive responses to cool climates

Pettersen

Ruuskanen

Nord

et al. 2022

Preprint

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The thermal sensitivity of early life stages can play a fundamental role in constraining species distribution. For egg-laying ectotherms, cool temperatures often extend development time and exacerbate developmental energy cost. Despite these costs, egg laying is still observed at high latitudes and altitudes. How embryos overcome the developmental constraints posed by cool climates is crucial knowledge for explaining the persistence of oviparous species in such environments and for understanding thermal adaptation more broadly. Here, we studied maternal investment, and embryo energy use and allocation in wall lizards spanning altitudinal regions, as potential mechanisms of local adaptation to development in cool climates. Specifically, we compared population-level differences in (1) investment from mothers (egg mass, embryo retention and thyroid yolk hormone concentration), (2) embryo energy expenditure during development, and (3) embryo energy allocation from yolk towards tissue. We found evidence that energy expenditure was greater under cool compared with warm incubation temperatures. Females from relatively cool regions did not compensate for this energetic cost of development by producing larger eggs or increasing thyroid hormone concentration in yolk. Instead, embryos from the high-altitude region used less energy to complete development, i.e., they developed faster without a concomitant increase in metabolic rate, compared with those from the low-altitude region. Embryos from high altitudes also allocated relatively more energy towards tissue production, hatching with lower residual yolk:tissue ratios than low-altitude region embryos. These results suggest that local adaptation to cool climate in wall lizards involves mechanisms that regulate embryonic utilisation of yolk reserves and its allocation towards tissue, rather than shifts in maternal investment of yolk content or composition.

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Hepatic Metabolomic Responses to Low-Temperature Stress in the Invasive Turtle, Trachemys scripta elegans

Tang,

Guo,

Yang

et al. 2024

Animals

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Investigating the physiological and biochemical changes of ectothermic species before entering hibernation would contribute to the understanding of how they adapt to low-temperature environments. Here, red-eared slider turtle (Trachemys scripta elegans) hatchlings were maintained under different thermal treatments (24 °C, slowly decreasing temperatures from 24 °C to 14 °C, and to 4 °C). Hepatic metabolite alterations were measured to assess the metabolic impacts of low-temperature stress in this species. Of these differentially changed metabolites, some (e.g., raffinose, spermidine, allocholic acid, taurohyocholate, 2-ketobutyric acid, acetylcysteine) were shown to decrease, while others (e.g., stearolic acid, D-mannose) increased in low-temperature treatments. Our results indicated that short-term low-temperature stress might have limited impacts on lipid and energy metabolism in this species. The changes in other metabolites (e.g., allocholic acid, taurohyocholate, spermine, acetylcysteine) might be associated with a low food intake (and thus reduced digestive performance) and weakened immune ability of low-temperature-exposed animals.

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Divergent incubation temperature effects on thermal sensitivity of hatchling performance in two different latitudinal populations of an invasive turtle

Cited by 3 publications

References 56 publications

Population divergence in maternal investment and embryo energy use and allocation suggests adaptive responses to cool climates

Population divergence in maternal investment and embryo energy use and allocation suggests adaptive responses to cool climates

Population divergence in maternal investment and embryo energy use and allocation reveals adaptive responses to cool climates

Hepatic Metabolomic Responses to Low-Temperature Stress in the Invasive Turtle, Trachemys scripta elegans

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